Investigations continue into Las Vegas shooting, deadliest shooting in US modern history

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At least 59 people were killed and 527 injured in Las Vegas Sunday night (01) when a gunman opened fire on a music festival crowd from the 32nd floor of the Mandalay Bay Resort and Casino, in what is now the deadliest shooting in modern U.S. history.

The death toll from the incident could possibly go up, said Clark County Coroner John Fudenberg in a press conference last afternoon.

Jason Aldean was the headliner of Sunday night's concert; video showed him rushing off the stage amid the gunfire. Other performers from this weekend included country stars Jake Owen, Big & Rich, Luke Combs and Dylan Scott.

An official with Las Vegas’ McCarran International Airport said "an airport perimeter fence near the concert venue was breached by people fleeing the scene of the incident," and airport staff "transported those people to the designated evacuation site."

A spokesperson for Allegiant Air said about 30 people who fled onto the airfield were sheltered overnight at one of the airline's facilities there. The airline said its staff helped people get clothes, charge their phones and contact loved ones.

Details of suspect emerge:

Authorities said the suspected gunman -- 64-year-old Mesquite, Nevada resident Stephen Paddock -- checked into the Mandalay Bay hotel Thursday and brought the numerous firearms found in his room himself.

Two sources familiar with the investigation said there was a combination of rifles and handguns at the scene, and one of the sources said there were 23 weapons in the room.

Ammunition and more than 10 suitcases were found in the room, Lombardo said. At one point, Paddock engaged with a security guard, who was shot in the leg through a doorway, Lombardo said.

In the wake of the shooting, the Las Vegas Police Department said authorities responded to a room on the 32nd floor of the hotel, where Paddock was found dead. Police said they believe Paddock killed himself prior to police entry.

Police said Paddock had no criminal history, save a minor citation.

Investigations continue:

By last afternoon, investigators had finished processing the hotel room at Mandalay Bay, the location of the music festival and Paddock's home in Mesquite, and SWAT officers were standing by another house in northern Nevada, Lombardo said.

Authorities found 19 additional firearms, explosive and some 1,000 rounds of ammunition at the Mesquite home, Lombardo said.

Police confirmed this evening that they found several pounds of ammonium nitrate -- a material used to make explosives -- inside the suspect’s car.